Cutter-head for rock-drilling machines.



I J. l. TRAKIMAS. CUTTER HEAD FUR ROCK DRILUNG MACHiNES.

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1 ,290,41 5: Patented Jan. I'. 1M9.

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UNITED STATES PATENT OFFICE.

JACOB J. TRAKIMAS, OF WATERTOWN. NEW YORK.

CUTTER-HEAD FOR ROCK-DRILLING MACHINES.

" 1/ whom it may cmmcm:

lie it known that I. Jacon J. mamas, a

itizen ol' the l nited States. residing at 'a-' *rtown. in the county of .letterson and State. t' New York, have invented certain new nd uset'ul Improvements in littt'l'*llltltt i TH Rock-Drilling h laehines of which the .il towing is a specification. reference being ad to the accompanying: drawings.

This invention relates to drilling maliines used in mining operations and nnder kc cir umstances for drilling coal and rock, nd particularly to a cutter head designed be connected to the drill and so formed lat the knives or cutters ot' the cutter head ia v he readily removed and replaced. thus erinitting various forms of knives to he sed andpermittiug the knives to he I'cadiiy rarpened whenever neecssary.

A l'itrther olrieet. is to provide a construe,- on of this character comprising a hotly ha v- 1Q a central socket for a drill hit. the body einpg split or slittud tangentially at a plualit v of points so as to provide a plurality t" yieldahle clamping jaws hetween whit-h ie knives or cutters are disposed and proide mean wherehy these jaws ma he urged ito clamping engagement with the knives.

A further olrieet is to provide a cutter ad of this character with a plurality of nives and jaws holding the knives in place nd provide a tapered sleeve engaging over he head and the knives, the slee\e heing adustahle on the head t tighten the knives in lace.

(lther oh ieets will app ar in the course of llt' tollovviuf description.

My invention is illustrated in the aeeonr auviug drawings. wherein Figure l is a side elevation with parts roken away of a rock drill ronstrueted in eeordanee with my invention:

Fig. 2 is a side elevation of the cutter nlli orting' head with the cutters and outer leeve removed:

Fig, 3 is a front, elevation of the rntter upporlinghead;

Fig. 4 is a perspective view of one of the utters: and

Fi i. 5 is an elevation ol the central drill.

Referring to these figures. it will be seen hat this cutter head eoniprises a body 16. nd a shank which is formed with a circular r e vlindriral portion 11 adjacent the body lid with a square tapered portion 12, hav- 11;; a notch 13 on one face. This tapered Specification of Letters Patent.

Application filed July 10. 1918.

Patented Jan. 7, 1919.

Serial No. 244,206.

shank 12 is adapted to he inserted within the spindle or dritl shaft 11 ot' a mining drill, and held in place therein in any suitable manner.

The body has a central horc or socket 15 for the reception of the shank of a drill 16 and this body is slitted to provide a plurality ot' jaws l7. Thest, jaws extend in a helieal relation to the central axis of the body and each jaw 17 is relatively flattened on one face as at 1.8 and is rahheted on the other face as at 19 to form a seat for a cutting knife. The jaws are connected to the body at their upper ends and formed integral therewith hut. are separated from each other-tor the greater portion of their length by spirally disposed slots 20 which slots intersect the bore 15 at the lower ends of the jaws on a line tangential to the bore. as shown clearly in Fig. 3. Because the lower portions of the iaws are separated from each other b v means of these slots :20, it is ohvious that the jaws may be forced together so as to bind on the centrally disposed drill 16 and to bind upon the cutters or blades disposed between the jaws. The lower end of each jaw beveled downward and contrally toward the point of the as at 21. The outer face. of the hotly 10 and the outer fares of the jaws are tapered upward, the greatest diameter of the body being on the line a-a.

The central drill 16 is a twist drill and has a shank '3'. whieh fits the hore 15. :tttll ot' the cutters 23 has a slight twist from end to end so that it will lit in the space between two of the jaws 17 and has a length some what greater than the length of the hody so.

that when the cutter is in place the outer edg s l'a ot' the cutter is flush with the outer in. so the jaws. The. outer face of the bud and ot the jaws is screw-threaded as at 2-1.

For the purpose. of holding the cutters in place and causing the jaws to clamp upon the cutters. T provide the somewhat tapering: ehnnping collar 25 interiorly screwthreaded for engagement with the screwth eads 24. 'hen this collar is in place and turned down it wedges the jaws inward and there tore wedges the jaws into clamping engagement with the cutters and with the central drill. Preferably the upper end of the collar is formed with notches 26 wherehr a wrench may he applied to the collar and the collar screwed into place. Preferably the exterior face of the body 10 and the exterior face of the collar are formed with left hand scrciwtlireads which causes this collar or sleeve 25 to bind or screw down upon the knives and drill body when the drill is rotated in its operation.

In order to prevent the knives 23 from moving rearward and becoming unscrewed from their clamped position, I provide a second collar 27 which surrounds the rounded portion 11 of the shank and is held in place thereon by set screws Preferably the clamping collar or sleeve is formed upon its exterior face with a plurality of spiral or helical grooves 28 whereby the coal or rock dust may escape. The spiral flanges 30 are also arranged upon the drill shait H for the same purpose. In order to hold the central drill 16 in place, I ma 1 provide a set screw 31 which rasses through the body 10 as illustrated in l ig. 2. and engages the drill 16.

I have illustrated a drill with six knives but it will, of course, be obvious that the body of the drill might be made to accommodate a greater or less number and further that less than six knives may be used, if desired. on a drill having grooves to acconnumlate six knives. These knives are made of high speed steel as is the drill body itself and the knives can be adjusted so as to drill any desired character of hole. The drill and the knives or cutters are all held in place by one band. The holder or head is designed to fit any mining machine and thus it is not necessary to change machines in order to drill different kinds of drill holes. It will be obvious that this drill is very simple. that it may be readily kept in good condition, and that it will increase production.

What I claim is 1 In a drill head, a. body having a central bore. the body for a portion of its length being longitudinally slit to define a plurality of jaws. each of said jaws being grooved on one face. cutting knives disposed n said grooves, and means detachably disposed around the body for lotking said cutting knives in place and forcing the jaws toward the axial center of said head and toward each other. to thereby clamp the cutting knives in place.

2. A drill head of the character described comprising a body having a shank, the body having a central socket and being longitudinally slittcd at a plurality of points to form a plurality of radially disposed jaws surrounding the central socket, each of said jaws being grooved on one face to receive the cutter. the said slits and the grooves extending helically with relation to the axis ol'the head. knives disposed in said grooves,

and an adjustable collar surrounding the body and urging said jaws toward the axial enter of the body to thereby hold the knives in clamped engagement.

3. A drill head of the character described comprising a body having a shank. the body being upwardly tapered and having a central bore and being formed with a plurality of helically extending slits intcrserting said central bore to provide a plurality of helically arranged jaws, each jaw being grooved upon one face to receive a utter, the exterior of the body being screw-thrcaded. knives disposed in said grooves, and an interiorly screw threaded tapered collar adapted to engage the body and urge the jaws toward the axial center of the body and into clamping engagement with the cutters.

-l-. A drill head of the character described comprising a body having a shank, the body being upwardly tapered and having a central bore and being formed with a plurality of helically extending slits intersecting said central bore to provide a plurality of helically arranged jaws, each jaw being grooved upon one face to receive a cutter, the exterior of the body being screwthreaik ed, knives disposed in said grooves, an interiorly screw threaded tapered collar adapted to engage the body and urge the jaws toward the axial center of the body and into clamping engagement with the rut ters, and a collar embracing the shank and abutting against the ends of the knives and holding the knives in placoagainst longitudinal inovcmentj 5. A drill of the character described comprising an upwardly tapered body. a shank. the body having an upwardly extending socket at its lower end for the reception of a central drill and being formed with a plurality ot' helically extending slits intersecting the lower end of the bore at a tangent thereto, the slits defining a plurality of jaws, each of said jaws extending helically and being formed with a longitudimdly extending groove in one face to receive a cutter. cutters disposed in said groove. a drill having a shank disposed in the socket, and an upwardly tapering clamping collar having screw-threaded engagement with the upper face of the body and adaptedto farce the jaws toward the axial center of the body to thereby clamp the drill and said cutters in lace.

n testimony whereof I hereunto afiiX my signature in the presence of two witnesses.

JACOB .l. TRA KIMAS.

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